S-91268A655 1/2"-13 x 5" ASME B18.2.1, SAE J429 High-Strength Grade 8 Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 150,000 psi tensile strength for critical structural applications
• Superior wear resistance due to Rockwell C33 hardness, extending service life in demanding environments
• Reliable coarse UNC threading ensures faster assembly and reduced cross-threading risks in industrial settings
• Optimized partial threading design provides concentrated strength where needed while reducing material weight
• Precision Class 2A thread fit guarantees consistent engagement and vibration resistance
• Heavy-duty Grade 8 certification meets rigorous ASME B18.2.1 and SAE J429 standards for quality assurance
• Environmental compliance with RoHS 3 and REACH regulations for global industrial deployment

Professional Applications & Engineering Value

Engineered for heavy machinery, structural steel connections, and high-vibration equipment, this Grade 8 hex head screw addresses critical industrial challenges. The 1/2"-13 UNC coarse thread configuration maintains grip integrity under dynamic loads, while the partial threading concentrates stress away from shear planes. Manufactured from high-grade steel with external hex drive compatibility, it delivers superior torque transmission for bolted joints requiring 150,000 psi tensile strength. These features collectively prevent joint failure in construction, automotive, and manufacturing applications where corrosion resistance and long-term durability are paramount.

Specification Summary & Compliance

This 5" length fastener maintains Class 2A thread fit tolerances per UNC standards with 1/2"-13 coarse thread spacing. Manufacturing adheres to ASME B18.2.1 and SAE J429 specifications for dimensional accuracy. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for regulated industrial and international markets.